Removed IntrusiveSPtr.  There are no clients of this class anymore, so it is not needed, and it was never extensively tested.  If we need an intrusive reference-counting smart pointer, we can always import intrusive_ptr from boost.
Removed IntrusiveSPtr.  There are no clients of this class anymore, so it is
not needed, and it was never extensively tested.  If we need an intrusive
reference-counting smart pointer, we can always import intrusive_ptr from
boost.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@44571 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang